The reinvestigation of spermiogenesis in the proteocephalidean cestode Proteocephalus longicollis (Zeder, 1800) provides new details that were not described previously for this species. The 2 centrioles with roots are oriented at the first tangential to the long axis of the nucleus in a differentiation zone. They come to be arranged in the same plane only when a single intercentriolar body (ICB) appears between them. The ICB had been described previously as consisting of a number of dense elements (Swiderski, 1985) but, in the present study, appeared as a single, electron-dense plate. Also new for this species is the observation of 2 arching membranes that appear at the base of the differentiation zone only when the 2 flagella rotate toward the median cytoplasmic protrusion. Moreover, the formation of a crested body is described for the first time in P. longicollis. The present data support the suggestion that the process of spermiogenesis in proteocephalidean tapeworms corresponds in most features to that observed in some members of the unrelated tetraphyllidean clades, the Onchobothriidae and Phyllobothriidae. This may represent more evidence regarding the close relationship between tetraphyllidean and proteocephalidean cestodes, but existing information is fragmentary and controversial in some characters.
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February 2004
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February 01 2004
REINVESTIGATION OF SPERMIOGENESIS IN THE PROTEOCEPHALIDEAN CESTODE PROTEOCEPHALUS LONGICOLLIS (ZEDER, 1800)
Magdaléna Brun̆anská;
Magdaléna Brun̆anská
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branis̆ovská 31, 370 05 C̆eské Budĕjovice, Czech Republic. brunan@paru.cas.cz
* Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 01 Kos̆ice, Slovak Republic
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Tomás̆ Scholz;
Tomás̆ Scholz
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branis̆ovská 31, 370 05 C̆eské Budĕjovice, Czech Republic. brunan@paru.cas.cz
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Jana Nebesár̆ová
Jana Nebesár̆ová
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branis̆ovská 31, 370 05 C̆eské Budĕjovice, Czech Republic. brunan@paru.cas.cz
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J Parasitol (2004) 90 (1): 23–29.
Citation
Magdaléna Brun̆anská, Tomás̆ Scholz, Jana Nebesár̆ová; REINVESTIGATION OF SPERMIOGENESIS IN THE PROTEOCEPHALIDEAN CESTODE PROTEOCEPHALUS LONGICOLLIS (ZEDER, 1800). J Parasitol 1 February 2004; 90 (1): 23–29. doi: https://doi.org/10.1645/GE-3229
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